The Invisible Threat! (Also Silent)

1 Welcome to Area Fifty-Something 2 Danger Wears a Diaper 3 The Toy From Another World 4 The Bath Effect 5 The Fruit of All Evil 6 Frenemy Mine 7 Maximum B.O.B. 8 It Came... on a Field Trip 9 Educational Television 10 Flipped Out 11 The Wormhole Has Turned! 12 The Two Faces of Dr. Cockroach 13 The Thing with One Brain 14 Night of the Living Dog 15 Attack of the Movie Night! 16 98 Pound Cockroach 17 When Nature Shrieks 18 Vornicarn 19 It Got Out of Hand 20 The Sound of Fear 21 The Sorry Syndrome 22 Speak Not the Q Word 23 Screaming Your Calls 24 The Time-Out That Wouldn't End 25 Curse of the Man-Beast 26 It Came From Level Z 27 Number Seven! 28 The Friend Who Wasn't There 29 Driven to Madness 30 The Beast From 20,000 Gallons 31 The Sneezing Horror 32 Prisoner of the Dark Dimension 33 I Predict Horror 34 Destroy Chickie D! 35 The Mystery of Dr. Cutter 36 The Partymobile That Invaded Earth 37 Ginormicat! 38 My Monster, My Master 39 It Came From Channel 5 40 It Ruled With an Iron Fist 41 This Ball Must Be Dodged 42 It Spoke With Authority 43 Debtor Alive! 44 The Grade that Wouldn't Pass! 45 You Can't Breathe in a Diner in Space! 46 Race to the End...Zone! 47 When Luck Runs Out 48 That Which Cannot Be Unseen 49 Bride of the Internet 50 The Invisible Threat! (Also Silent)